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CAU
TION :
CAUT
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AUTI
ON
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CAUT
IO
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C
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CDBC TWIN
CDBCF TWIN
CDBC TWIN APS
CDBCF TWIN APS
DISCONTINUED VERSION
The information in this manual
is no longer current.
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
To ensure you have the latest revision of the manual or to obtain the illustrated parts catalog, please visit the Bunn-O-Matic website, at
www.bunn.com. This is absolutely FREE, and the quickest way to obtain the latest catalog and manual updates. Contact Bunn-O-Matic
Corporation at 1-800-286-6070 to obtain a paper copy of the required Illustrated Parts Catalog mailed via U.S. Postal Service.
36672.0000B 02/08 ©2004 Bunn-O-Matic Corporation
www.bunn.com
Page 2
BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY
Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows:
1) All equipment other than as specified below: 2 years parts and 1 year labor.
2) Electronic circuit and/or control boards: parts and labor for 3 years.
3) Compressors on refrigeration equipment: 5 years parts and 1 year labor.
4) Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis:
parts and labor for 3 years or 30,000 pounds of coffee, whichever comes first.
These warranty periods run from the date of installation BUNN warrants that the equipment manufactured by
it will be commercially free of defects in material and workmanship existing at the time of manufacture and
appearing within the applicable warranty period. This warranty does not apply to any equipment, component or
part that was not manufactured by BUNN or that, in BUNN’s judgment, has been affected by misuse, neglect,
alteration, improper installation or operation, improper maintenance or repair, damage or casualty. This warranty is
conditioned on the Buyer 1) giving BUNN prompt notice of any claim to be made under this warranty by telephone
at (217) 529-6601 or by writing to Post Office Box 3227, Springfield, Illinois 62708-3227; 2) if requested by
BUNN, shipping the defective equipment prepaid to an authorized BUNN service location; and 3) receiving prior
authorization from BUNN that the defective equipment is under warranty.
THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY, WRITTEN OR
ORAL, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF EITHER
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. The agents, dealers or employees of BUNN
are not authorized to make modifications to this warranty or to make additional warranties that are binding on
BUNN. Accordingly, statements by such individuals, whether oral or written, do not constitute warranties and
should not be relied upon.
If BUNN determines in its sole discretion that the equipment does not conform to the warranty, BUNN, at its
exclusive option while the equipment is under warranty, shall either 1) provide at no charge replacement parts
and/or labor (during the applicable parts and labor warranty periods specified above) to repair the defective
components, provided that this repair is done by a BUNN Authorized Service Representative; or 2) shall replace
the equipment or refund the purchase price for the equipment.
THE BUYER’S REMEDY AGAINST BUNN FOR THE BREACH OF ANY OBLIGATION ARISING OUT OF THE SALE OF
THIS EQUIPMENT, WHETHER DERIVED FROM WARRANTY OR OTHERWISE, SHALL BE LIMITED, AT BUNN’S
SOLE OPTION AS SPECIFIED HEREIN, TO REPAIR, REPLACEMENT OR REFUND.
In no event shall BUNN be liable for any other damage or loss, including, but not limited to, lost profits, lost sales,
loss of use of equipment, claims of Buyer’s customers, cost of capital, cost of down time, cost of substitute
equipment, facilities or services, or any other special, incidental or consequential damages.
BrewWISE, BUNN Gourmet Ice, BUNN Pour-O-Matic, BUNN, Bunn-OMatic, Bunn-O-Matic, BUNNlink, BUNNserve, BUNN
Espress, DBC, Dr. Brew, Dual, EasyClear, EasyGard, Easy Pour, FlavorGard, Gourmet Ice, Gourmet Juice, High Intensity,
IMIX, Infusion Series, Legendary for Quality, The Mark of Quality in Beverage Equipment Worldwide, My Café, PowerLogic, Safety-Fresh, Scale-Pro, Single, Smart Funnel, Smart Hopper, Soft Heat, SplashGard, System III, ThermoFresh,
392,AXIOM, Beverage Profit Calculator, Beverage Bar Creator, BrewLOGIC, BrewMETER, BrewWIZARD, BUNNSERVE,
BUNNsource, Coffee At Its Best, Cool Froth, Digital Brewer Control, Intellisteam, Nothing Brews Like a BUNN, Pouring
Profits, Pulse Wave, Quality Beverage Equipment Worldwide, Signature Series, Silver Series, Smart Heat, SmartWAVE,
Tea At Its Best, The Horizontal Red Line, Titan, Ultra, are either trademarks or registered trademarks of Bunn-O-Matic
Corporation.
INTRODUCTION
This equipment will brew one or two half-gallon batches of coffee simultaneously into awaiting dispensers
with just the press of a button. One side may include a hot water faucet for allied beverage use. Most functions
of the brewer are digitally controlled. It is only for indoor use on a sturdy counter or shelf.
Page 2
36672 011108
Page 3
CONTENTS
This equipment must be installed to comply
with the International Plumbing Code of the
International Code Council and the Food
Code Manual of the Food and Drug Administration (FDA). For models installed outside
the U.S.A., comply with the applicable
Plumbing /SanitationCode.
Introduction & Warranty .....................................................................................2
User Notices .......................................................................................................3
Electrical & Plumbing Requirements ...................................................................4
Operating Controls ..............................................................................................5
Initial Set-Up, Coffee Brewing, & Cleaning ..........................................................6
Adjustments & Optional Settings ........................................................................7
Adjusting Brew Volumes & Water Sensing Threshold Adjustment ......................8
Pulse Brew Setup Procedure ...............................................................................9
Troubleshooting ................................................................................................10
Diagnostics .......................................................................................................20
Service ..............................................................................................................21
Wiring Diagrams ...............................................................................................30
USER NOTICES
Carefully read and follow all notices in this manual and on the equipment. All labels on the equipment should
be kept in good condition. Replace any unreadable or damaged labels.
#37881.0000
#00658.0000
#29007.0000
#00656.0000
#00986.0000
#03408.0002
#28694.0000
#12364.0000
Page 3
#03409.0002
36672 020708
Page 4
ELECTRICAL REQUIREMENTS
GREEN GREEN
CAUTION - The brewer must be disconnected from the power source until specified in Initial Set-Up.
RED
WHITE
NEUTRAL
BLACK
L2
N
L1
120 V.A.C.
120 V.A.C.
208 or 240 V.A.C.
Note: This electrical service consists of 3 current carrying conductors
(Neutral, L1 and L2) and a separate conductor for earth ground.
Refer to Data Plate on the Brewer, and local/national electrical codes to
120/208 and 120/240 volt ac models
determine circuit requirements.
Electrical Hook-Up
CAUTION – Improper electrical installation will damage electronic components.
1. An electrician must provide electrical service as specified.
2. Using a voltmeter, check the voltage and color coding of each conductor at the electrical source.
3. Remove the front panel beneath the sprayhead.
4. Feed the cord through the strain relief and connect it to the terminal block(s).
5. Connect the brewer to the power source and verify the voltage at the terminal block(s) before proceeding.
Replace the front panel.
6. If plumbing is to be hooked up later be sure the brewer is disconnected from the power source. If plumbing
has been hooked up, the brewer is ready for Initial Set-Up.
PLUMBING REQUIREMENTS
These brewers must be connected to a cold water system with operating pressure between 5 and 90 psi
(34.5 and 620 kPa) for CDBC models. A shut-off valve should be installed in the line before the brewer. Install
a regulator in the line when pressure is greater than 90 psi (620 kPa) to reduce it to 50 psi (345 kPa). The water
inlet fitting is 3⁄8" flare. Bunn-O-Matic does not recommend the use of a reverse-osmosis or deionized water
supply to this equipment.
NOTE - Bunn-O-Matic recommends 3⁄8" copper tubing from a 1⁄2" or larger water supply line. A tight coil of cop-
per tubing in the water line will facilitate moving the brewer to clean the countertop. Bunn-O-Matic does not
recommend the use of a saddle valve to install the brewer. The size and shape of the hole made in the supply
line by this type of device may restrict water flow.
This equipment must be installed to comply with the International Plumbing Code of the International
Code Council and the Food Code Manual of the Food and Drug Administration (FDA). For models installed outside the U.S.A., you must comply with the applicable Plumbing/Sanitation Code for your area.
Plumbing Hook-Up
1. Flush the water line.
2. Securely attach it to the flare fitting at the rear of the brewer.
3. Turn on the water supply.
Page 4
36672 020708
Page 5
OPERATING CONTROLS
CDBCA
ENABLE
ON / OFF
BREW
WARMER WARMER
ENABLE
ON / OFF
BREW
WARMER
WARMER
CAUTION
FAILURE TO COMPLY RISKS INJURY
!
D
B
C
A
D
B
A
C
E
A) ENABLE BREW ON/OFF SWITCH
Pressing the "ON/OFF" switch (indicator glowing) supplies
power to the brew station warmer, enables the brew circuit,
and energizes the tank refill circuit. Pressing the switch
again (indicator not glowing) stops tank refilling, brewing
and deenergizes the brew station warmer. Stopping a brew
cycle after it has been started will not stop the flow of water
into the decanter/server until the funnel is empty.
NOTE – Hot water will be available at the faucet in a limited
amount when the "ON/OFF" indicator is not glowing because
the tank will not refill.
(B) BREW SWITCH
Momentarily pressing and releasing the switch starts a brew cycle when the "ON/OFF" indicator is glowing.
NOTE – The "ON/OFF" indicator must be glowing to initiate and complete a brew cycle.
P1869
(C) ADDITIONAL WARMER SWITCHES
Pressing any additional warmer switch so the indicator is glowing, supplies power to associated warmer.
(D) READY INDICATOR
This indicator glows when the preset temperature has been achieved. The word "NOT" above "READY" will
glow in all other instances.
(E) MAIN ON/OFF SWITCH
This switch, located on the left side of the brewer, turns power on and off to all components in the brewer.
Page 5
36672 020708
Page 6
INITIAL SET-UP
1. Insert an empty funnel into the funnel rails of one of the brew stations.
2. Place an empty decanter/server under the funnel.
3. Connect the brewer to the power source.
4. Press the "ON/OFF" switch (indicator glowing).
5. Water will flow into the tank and stop when the tank is filled to its capacity.
6. Wait approximately twenty minutes for the water in the tank to heat to the proper temperature.
7. Place a small vessel beneath the faucet and open the faucet handle. Release it when you hear water once again
flowing into the tank.
8. With the "ON/OFF" switch still in the "ON" position (indicator glowing), momentarily press and release the "BREW"
switch.
9. Allow the cycle to finish and measure the amount of water in the decanter/server. It should be 64 ounces ± 2. Refer
to the adjustments section of this manual should the volume need to be increased or decreased.
NOTE: Repeat steps 1 through 9 for the other brew station.
The brewer is now ready for use in accordance with the coffee brewing instructions below.
COFFEE BREWING
1. Insert a BUNN filter into the funnel.
2. Pour the fresh coffee into the filter and level the bed of grounds by gently shaking.
3. Slide the funnel into the funnel rails.
4. Place an empty decanter/server beneath the funnel.
5. Press the "ON/OFF" switch (indicator glowing), then momentarily press and release the "BREW" switch.
6. When brewing is completed, simply discard the grounds and filter.
CLEANING
1. The use of a damp cloth rinsed in any mild, non-abrasive, liquid detergent is recommended for cleaning all surfaces
on Bunn-O-Matic equipment.
2. Check and clean the sprayhead. The sprayhead holes must always remain open.
CLEANING
1. The use of a damp cloth rinsed in any mild, nonabrasive, liquid detergent is recommended for cleaning all surfaces
on Bunn-O-Matic equipment.
2. Check and clean the sprayhead. The sprayhead holes must always remain open. Insert the short end of the spray-
head cleaning tool into each of the five water outlets of the plastic sprayhead to remove any mineral deposits.
3. Insert the long end of sprayhead cleaning tool into the sprayhead fitting, and rotate several times to remove any
mineral deposits from the fitting.
NOTE: In hard water areas, this may need to be done daily. It will help prevent liming problems in the brewer and takes
less than a minute.
NOTE: In the event that the "Brew Logic" circuit activates (compensating for high lime build up), it will temporarily disable
the "Recovery Booster" and "Pulse Brewing" systems until the unit has been de-limed. Refer to the Troubleshooting
section for more details.
Page 6
36672 020708
Page 7
ADJUSTMENTS & OPTIONAL SETTINGS
ENABLE
ON / OFF
BREW
WARMER WARMER
ENABLE
ON / OFF
BREW
WARMER
WARMER
HIDDEN
SWITCH
HIDDEN
SWITCH
P1871
NOTE: The following adjustments must be performed for each Brew Station.
Setting Brew Temperature
The brewer is factory set to brew at 200°F(95°C). To change this setting, press and hold the "HIDDEN" switch
beneath the "®". The word "TEMP" above the "ON/OFF" switch will glow to correspond with the temporary function
change of this switch. Repeatedly press and release the "ON/OFF" switch until one of the bank of temperature
indicators shows the approximate desired temperature. When two indicators are glowing, the temperature is
approximately the number between them.
Setting Brew Lockout
The brewer is factory set with the brew lockout disabled. Brew lockout prevents starting a brew cycle if the
ready indicator is not glowing. When an attempt at brewing cannot be allowed, the word "NOT" and "LOCKOUT"
flash for three seconds to indicate the reason the brew can't begin. To change the condition of the brew lockout,
press and hold the "HIDDEN" switch beneath the "®" and momentarily press the "BREW" switch.
Adjusting Automatic Warmer Shut-Off
The brewer is factory set with this feature disabled. The automatic warmer shut-off deenergizes all warmers after a predetermined time period after the most recent brew cycle. To change the setting, press and hold
the "BREW" switch and the "HIDDEN" switch beneath the "®" for five seconds, the entire bank of temperature
indicators will flash on-and-off. Release both switches. Pressing and releasing the "BREW" switch will select the
number of temperature indicators from none to five. When no indicators are glowing, this feature is disabled
and all warmers will be controlled only by their respective switches. When one to five indicators are glowing, it
indicates the approximate number of hours of delay before all warmers will be automatically deenergized after
the most recent brew cycle.
IMPORTANT: The tank must be full and refill solenoid shut off prior to making these adjustments.
Sprayhead must be installed while making these adjustments.
Page 7
36672 020708
Page 8
ADJUSTING BREW VOLUMES
The brewer is factory set to deliver 64 ounces ± 2 for each brew cycle.
BREW VOLUME SET-UP: Use the following steps when the setting is unknown or a different circuit board is
being installed.
1. Place an empty funnel in the funnel rails and an empty decanter/server or graduated vessel beneath the funnel.
2. Press the "ON/OFF" switch (indicator glowing).
3. Press and hold the brew start button until you hear the brew solenoid click on-and-off three times (approximately 10 seconds). Release the button.
4. Allow the cycle to continue until the desired amount of water is dispensed and then turn "OFF" the brewer.
The brewer is now set to dispense this amount of water for each subsequent brew cycle.
To increase the amount of water for each brew cycle place an empty funnel in the funnel rails and an empty
decanter/server or graduated vessel beneath the funnel. Press the "ON/OFF" switch. Press and hold the "BREW"
switch until you hear the solenoid click on-and-off three times (approximately 10 seconds), then release the
"BREW" switch. Momentarily press and release the "BREW" switch once for each ounce (approximate) of water
to be added to the prior setting and allow the brew cycle to finish.
To decrease the amount of water for each brew cycle place an empty funnel in the funnel rails and an empty
decanter/server or graduated vessel beneath the funnel. Press the "ON/OFF" switch. Momentarily press and release
the "BREW" switch once for each ounce (approximate) of water to be removed from the existing setting. Press
and hold the "BREW" switch until you hear the solenoid click on-and-off three times (approximately 10 seconds),
then release the "BREW" switch and allow the cycle to finish.
WATER SENSING THRESHOLD ADJUSTMENT PROCEDURE
1. Make sure the tank is full of water to be used for calibration. The water must be in contact with the refill
probe.
2. Unplug the brewer from the power source, then press and hold the BREW button while power is reapplied.
3. Continue pressing the BREW button until the READY indicator begins to flash. Release the BREW button and
then press it again momentarily.
4. The new calibration is automatically completed within a few seconds. If the water is too pure for use with the
brewer, the READY indicator will flash very rapidly and the old calibration will be retained.
Page 8
36672 030104
Page 9
PULSE BREW SETUP PROCEDURE
The pulse brew parameters (initial fill time, off times, and remaining on times) are entered using the following
set-by-example process.
1. First set the brew volume using the standard procedure in Brew Volume Setup.
2. Position an empty container under the sprayhead. Allow the tank to finish refilling. Make sure that the READY
lamp is on, or that the BREW LOCKOUT function is turned off.
3. Press and hold the "ON/OFF" button. The brew valve will turn on after 10 seconds. Release the button. This
begins the initial on-time setting. When the spray has continued for the desired time, momentarily press
the "ON/OFF" button.
4. The spray is now stopped and the off time setting has begun. Press the "ON/OFF" button momentarily to end
the off time.
5. The spray is now on again and the remaining on time setting has begun. Press the "ON/OFF" button momen-
tarily at the end of the desired remaining on time.
6. The setup is now complete and the parameters are stored in memory. The spray will continue the off and
on cycles until the brew volume of step 1 is complete. Pressing the "ON/OFF" button again will terminate the
brewing cycle, with the parameters stored in memory.
7. If only a preinfusion is desired, i.e. an initial on time followed by one off period, use the same procedure, but
stop after step 4 and allow the brew to finish the volume set in step 1. This will store the initial on time and
off time in memory.
Procedure for Disabling Pulse Brew or Preinfusion:
1. Position an empty container under the sprayhead. Allow the tank to finish refilling. Make sure that the READY
lamp is on, or that the BREW LOCKOUT function is turned off.
2. Press and hold the "ON/OFF" button. The brew valve will turn on after 10 seconds. Release the button.
3. Allow the spray to continue and press no buttons until spray stops. The pulse and preinfusion functions are
now disabled.
NOTE: When the brewer has been set up for pulse or preinfusion, the adjustment of brew volume is done the same
as always and has no effect on the pulse brew parameters. The pulsing is temporarily disabled while adjusting
the brew volume and automatically returns during normal brewing.
Page 9
36672 030104
Page 10
TROUBLESHOOTING
A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems
encountered. If the problem remains after exhausting the troubleshooting steps, contact the Bunn-O-Matic
Technical Service Department.
• Inspection,testing,andrepairofelectricalequipmentshouldbeperformedonlybyqualiedservicepersonnel.
• Allelectroniccomponentshave120voltacandlowvoltagedcpotential on their terminals. Shorting of
terminals or the application of external voltages may result in board failure.
• Intermittentoperationofelectroniccircuitboardsisunlikely.Boardfailurewillnormallybepermanent.If
an intermittent condition is encountered, the cause will likely be a switch contact or a loose connection at a
terminal or crimp.
• Solenoidremovalrequiresinterruptingthewatersupplytothevalve.Damagemayresultifsolenoidsare
energized for more than ten minutes without a supply of water.
• Theuseoftwowrenchesisrecommendedwheneverplumbingttingsaretightenedorloosened.Thiswill
help to avoid twists and kinks in the tubing.
• Makecertainthatallplumbingconnectionsaresealedandelectricalconnectionstightandisolated.
• Thisbrewerisheatedatalltimes.Keepawayfromcombustibles.
WARNING – • Exerciseextremecautionwhenservicingelectricalequipment.
• Unplugthebrewerwhenservicing,exceptwhenelectricaltestsarespecied.
• Followrecommendedserviceprocedures.
• Replaceallprotectiveshieldsorsafetynotices.
Before troubleshooting this brewer, check for the following:
A. Control Boards
Make sure ribbon cable is properly attached to the control board (ALL PINS INSERTED INTO PLUG).
Make sure there is a nylon insulating washer under each screw head that holds the control board to the plastic
front end cap. This is important for proper operation.
B. Make sure before servicing brewer that voltage is present at control board.
Press any warmer switch or observe if any indicator lights are glowing on the control panel. If so, proceed
with testing. If not, check for voltage across pins 1 & 2 of the ten pin J1 connector (black and white wires).
If voltage is present, replace the control board. If voltage is not present, check wiring and voltage across
terminal block(s) (black and white). Correct the problem and retest before proceeding with testing.
Page 10
36672 030104
Page 11
TROUBLESHOOTING (cont.)
REFILL CIRCUIT
PROBLEM
Will not fill or refill
PROBABLE CAUSE REMEDY
1. Power off to brewer
Press ON/OFF switch on control
panel to determine if power is
"ON".
2. Water shut off
3. Display flashing
Make sure water is ON.
Brewer has shut down due to malfunction (See Diagnostic Chart in
manual, Page 20, or under top lid
of brewer).
4. ON/OFF Switch
Make sure ON/OFF Switch is "ON"
and indicator is lit.
5. Lime build up on Probe
Remove the Probe and check for
lime deposit on tip. Clean and
reinstall.
6. Refill Valve or Control Board
Disconnect the brewer from the
power source and remove wires
from refill valve coil. Check for
continuity across the terminals of
the solenoid coil. If continuity is not
present, replace the refill valve (See
page 28). If continuity is present,
the coil may be stuck closed. Shut
water off to brewer. Set the ON/OFF
switch to the "OFF" position. Open
the faucet and drain water down in
the tank until flow stops or slows
to a trickle. Attach a voltmeter to
the terminals of the refill solenoid.
Connect the brewer to the power
source. Press the switch "ON".
Within five seconds, voltage should
be present at the solenoid terminals.
If voltage is not present, refer to
the wiring diagrams and check the
wiring harness.
Fill or refill does not shut "OFF"
(ON/OFF Switch "ON")
7. Water is too conductive for proper
operation when using the factory
setting of sensing threshold
1. Lime build up on probe
Page 11
Reset the Water Sensing Threshold
Adjustment Procedures on page
8.
Remove Probe and check for lime
deposits on tip. Clean and reinstall.
36672 030104
Page 12
TROUBLESHOOTING (cont.)
REFILL CIRCUIT (cont.)
PROBLEM
PROBABLE CAUSE REMEDY
2. Water Level Probe Sensing
System
Disconnect the brewer from the
power source. Disconnect the J3
connector from the control board.
Check for continuity from the nut on
top of the level probe to pin 1 of the
plug, continuity should be present.
Pull the temperature probe up about
an inch from the grommet. Check
for continuity from the outside surface of the temperature probe and
pin 4 of the plug, continuity should
be present. Connect the J3 plug to
the control board and proceed to
step 3.
3. Refill valve or control board
Press ON/OFF switch to "ON" (Indicator lamp should be lit). If water
continuously flows out of air vent
tube, disconnect the brewer from
the power source. If water flow
stops, replace the control board.
(See page 22) If water flow does
not stop, repair or replace the refill
solenoid. (See page 28)
Fill or refill does not shut "OFF"
(ON/OFF Switch "OFF")
4. Water is too conductive for proper
operation when using the factory
setting of sensing threshold.
1. Refill valve or control board
Reset the Water Sensing Threshold
Adjustment Procedures on page
9.
If water continuously flows out of
air vent tube, disconnect the brewer
from the power source. If water flow
does not stop, repair or replace
the refill solenoid. (See page 28)
If the valve closes when power is
removed, replace the control board.
(See page 22)
Page 12
36672 030104
Page 13
TROUBLESHOOTING (cont.)
HEATING CIRCUIT
PROBLEM
Water does not heat to proper
temperature
IMPORTANT: Make sure no temperature tests are taken before
the ready light is "ON". Tank temperature must be stabilized before
readings are taken.
PROBABLE CAUSE
1. Display flashing
2. Water not touching temperature
probe
3. Dry Plug In Probe Sensing
System
REMEDY
Brewer has shut down due to
malfunction (See Diagnostic
Chart in manual, Page 20, or
under top lid).
Remove probe and grommet.
Look into hole on tank lid. Water
must be within one inch from top
of tank.
Disconnect the brewer from the
power source. Disconnect the J3
connector from the control board.
Check for continuity from the tank
mounting screw where the green
wire mounts, to pin 2 of the plug,
continuity should be present. Pull
the temperature probe up about an
inch from the grommet. Check for
continuity from the outside surface
of the temperature probe and pin
4 of the plug, continuity should
be present. Connect the J3 plug
to the control board and proceed
to step 4.
Page 13
36672 030104
Page 14
TROUBLESHOOTING (cont.)
HEATING CIRCUIT
PROBLEM
Water does not heat to proper
temperature (cont.)
IMPORTANT: Make sure no temperature tests are taken before
the ready light is "ON". Tank temperature must be stabilized before
readings are taken.
PROBABLE CAUSE
4. Temperature Probe
5. Limit Thermostat
REMEDY
Remove the probe from the grommet and submerge in a water bath
of approximately 70°F(21°C). Connect an ohmmeter to pins 3 and 4
of the J3 connector. At 60°F(16°C)
the reading should be 15.3k ± 2k
OHMS, at 70°F(21°C) the reading
should be 11.8k ± 2k OHMS, and
at 80°F(27°C) the reading should
be 9.3k ± 2k OHMS. If the probe
is within these parameters, reconnect the J3 plug to the control
board.
Disconnect the brewer from the
power source. Check for continuity
across the limit thermostat terminals. Continuity should be present.
If not replace the limit thermostat.
(See page 25)
Spitting or excessive steaming
6. Tank Heater
1. Lime build up on temperature
probe, tank or tank heater
Disconnect the brewer from the
power source. Check for continuity
between the white terminal of the
terminal block and the black wire
on the relay on the control board.
There should be a low OHM reading. If no continuity is present,
check for a wiring problem, then
replace the tank heater if no wiring
problem is found. (See page 26)
Inspect probe and tank assembly
for excessive lime deposits. Delime
as required.
Page 14
36672 030104
Page 15
TROUBLESHOOTING (cont.)
HEATING CIRCUIT
PROBLEM
Spitting or excessive steaming
(cont.)
PROBABLE CAUSE
2. Temperature Probe
3. Control Board
REMEDY
Remove the probe from the grommet and submerge in a water bath
of approximately 70°F(21°C). Connect an ohmmeter to pins 3 and 4
of the J3 connector. At 60°F(16°C)
the reading should be 15.3k ± 2k
OHMS, at 70°F(21°C) the reading
should be 11.8k ± 2k OHMS, and
at 80°F(27°C) the reading should
be 9.3k ± 2k OHMS. If the probe
is within these parameters, reconnect the J3 plug to the control
board.
Set the temperature to 200°F
(95°C). Let tank temperature
stabilize. If temperature in tank is
above temperature setting by more
than 7°F, replace the control board.
(See page 22)
Brewer is making unusual noises
1. Plumbing lines
2. Water supply
3. Lime build up
Plumbing lines should not rest on
the counter top.
The brewer must be connected to
a cold water supply.
Remove the tank lid and clean inside of tank with a deliming agent,
if necessary.
Page 15
36672 030104
Page 16
TROUBLESHOOTING (cont.)
BREWING CIRCUIT
PROBLEM
Brew cycle will not start
PROBABLE CAUSE REMEDY
1. Display flashing
Brewer has shut down due to
malfunction (See Diagnostic Chart
in manual, Page 20, or under top
lid of brewer).
2. No water
Water lines and valves to the
brewer must be open.
3. No power or incorrect voltage
to the brewer
Check for voltage across the black
and white terminals at the terminal
block(s).
4. ON/OFF switch not in the "ON"
The indicator lamp must be lit
position
5. Low water temperature (Brew
lockout is enabled)
Allow brewer to heat until ready
lamp is lit, or disable the brew
lockout feature. (See page 7)
6. Water not touching refill probe
inside tank
7. Switch panel
Press ON/OFF switch (indicator
must be lit). Brewer will refill until
water touches probe inside tank.
Water must be in contact with
refill probe before brew cycle will
start.
Disconnect the brewer from the
power source. Disconnect the
ribbon connector from the control board. Check for continuity
between pins 1 & 2 (An arrow on
the connector indicates pin 1).
No continuity should be present.
Press the BREW switch. Continuity should be present for as long
as the switch is held "ON". If no
continuity is present, replace the
switch membrane decal. (See
page 23)
Page 16
36672 030104
Page 17
TROUBLESHOOTING (cont.)
BREWING CIRCUIT (cont.)
PROBLEM
Brew cycle will not start (cont.)
Consistently low beverage level in
the dispenser or beverage overflows dispenser
PROBABLE CAUSE REMEDY
8. Control board or dispense
valve
If the switch panel is operating
properly, proceed as follows. Attach a voltmeter to the terminals
of the dispense solenoid. Connect
the brewer to the power source.
Turn on the brewer and press the
BREW switch. Voltage should be
present at the solenoid terminals.
If voltage is not present, refer to
the wiring diagrams and check the
wiring harness. If voltage is present, check for continuity across
the terminals of the solenoid coil.
If continuity is not present, replace
the solenoid (See page 24). If continuity is present, the valve may be
stuck closed.
1. Brew volume
Set up brewer according to instructions in section Adjustments-
Brew Volumes. (See page 8) Using
a stop watch or second hand, time
the length of the brew cycle. Record this time inside the top lid. If
service is ever needed again, use
the time as reference to determine
if time has changed.
2. Lime build up
3. Dispense Valve
Page 17
Inspect the dispense valve and
sprayhead for excessive lime deposits. Delime as required.
Remove dispense valve and clear
any obstructions. Rebuild or
replace valve if necessary. (See
page 24)
36672 030104
Page 18
TROUBLESHOOTING (cont.)
BREWING CIRCUIT (cont.)
PROBLEM
Dripping from sprayhead
Weak beverage
PROBABLE CAUSE REMEDY
1. Lime build up
Inspect the tank assembly for
excessive lime deposits. Delime
as required.
2. Dispense valve
Remove the dispense valve and
clear any obstructions. Rebuild
or replace the valve if necessary.
(See page 24)
1. Sprayhead
A clean stainless steel sprayhead
must be used for proper extraction.
2. Water temperature
Place an empty brew funnel on an
empty decanter/server beneath
the sprayhead. Initiate brew cycle
and check the water temperature
immediately below the sprayhead
with a thermometer. The reading
must not be less than 195°F(91°C).
Adjust the temperature setting to
increase the water temperature.
Refer to Initial Set-up instructions.
3. Filter type
4. Coffee grind
5. Funnel loading
Page 18
BUNN paper filters must be used
for proper extraction.
A fine or drip grind must be used
for proper extraction.
The BUNN paper filter must be
centered in the funnel and the
bed of grounds leveled by shaking gently.
36672 030104
Page 19
TROUBLESHOOTING (cont.)
BREWING CIRCUIT (cont.)
PROBLEM
Dry coffee grounds remain in the
funnel
Low beverage serving temperature
PROBABLE CAUSE REMEDY
1. Sprayhead
Make sure sprayhead is present
and holes are clear and unobstructed. There should be separate
streams of water coming out of
each hole in the sprayhead.
2. Funnel loading
The BUNN paper filter must be
centered in the funnel and the
bed of grounds leveled by shaking gently.
1. Warmer
Disconnect the brewer from the
power source. Remove the warmer
plate and turn upside down to
expose the warmer terminals.
Remove the two wires. Check for
continuity across the two warmer
terminals. If continuity is not present, replace the warmer element
(See page 29). If continuity is
present, reconnect the wires to the
warmer element. Check for voltage
at the warmer terminals. Turn the
warmer switch "ON". The indicator
light will come on. Voltage should
be present at the terminals. If not,
disconnect power supply and
check wiring and switch.
Page 19
36672 030104
Page 20
DIAGNOSTICS
Intermittent flashing of the bank of temperature indicators indicates that a fault exists. Count the number of
flashes between pauses and use this chart as a guide to investigating the fault.
FLASHES CAUSE THINGS TO CHECK
1 Dry Plug - In Fault - Water Pressure (is water shut off?)
Sheath of temperature probe dry for 10 minutes after power-up Temperature probe wiring
Fill valve wiring, function, & strainer
Green wire between tank and circuit board
2 Low Tank Level Fault - Water pressure (is water shut off?)
Level probe dry for 7 minutes after fill valve is energized Level probe wiring
Temperature probe wiring
Fill valve wiring, function, & strainer
3 Low Water Temperature Fault - Tank heater wiring & function
Sensor in tank is calling for heat for 30 minutes or more Temperature probe wiring
4 Tank Sensor Disagreement - Temperature probe wiring
Level probe detects water, but dry plug-in probe dry Level probe wiring
Green wire between tank and circuit board
5 Temp Sensor Out-of-Range - High Sensor not connected to circuit board
6 Temp Sensor Out-of-Range - Low Sensor wires shorted together or to chassis
Page 20
36672 030104
Page 21
CAUTION :CAUTION :
CAUTION :
CAUTION :
CAUTION
!
CAUTION
!
SERVICE
This section provides procedures for testing and
replacing various major components used in this
brewer should service become necessary. Refer to
Troubleshooting for assistance in determining the
cause of any problem.
WARNING - Inspection, testing, and repair of electrical equipment should be performed only by qualified
service personnel. The brewer should be unplugged
when servicing, except when electrical tests are required and the test procedure specifically states to
plug-in the brewer.
COMPONENT ACCESS
WARNING - Disconnect the brewer from the power
source before the removal of any panel or the replacement of any component.
All components are accessible by the removal of
the top cover or warmer housing, front access panel
and warmer plate(s).
The top cover is attached with two #4-40
screws.
The front access panel is attached with five #6-32
screws or seven #6-32 screws on APS models.
Each warmer assembly is attached with three #4-40
screws.
Contents
Control Board .....................................................22
Switch Panel ...................................................... 23
Dispense Valve ...................................................24
Limit Thermostat ................................................25
Tank Heater ........................................................ 26
Refill Valve ......................................................... 28
Warmer Elements...............................................29
Wiring Diagrams ............................................... 30
P1872
FIG. 1 COMPONENT ACCESS
Page 21
36672 030104
Page 22
CAUTION :
CAUTION
!
SERVICE (cont.)
PC CONTROL BOARD
P1873
FIG. 2 CONTROL BOARDS
Location:
The Control Boards are located inside the top
cover behind the front end caps.
Test Procedures:
The test procedures for the control boards will
vary depending upon the problems experienced by
the brewer. Refer to the Troubleshooting guide beginning on page 10. The troubleshooting guide is divided
into three sections, Refill Circuit, Heating Circuit, and
Brewing Circuit.
Removal and Replacement:
1. Disconnect the black wire and blue wire from the
relay on the control board.
2. Disconnect the 10-pin connector and the 4-pin
connector from the main wiring harness.
3. Disconnect the 11-pin connector from the control
panel.
4. Remove the four #6 screws and four nylon washers and the two #4-40 screws securing the control
board to the end cap assembly.
5. Install a new control board and secure with the
four #6 screws and nylon washers and the two
#4-40 screws to the end cap assembly.
NOTE: The four nylon washers must be installed
under the heads of the four #6 screws to prevent
a possible shorting of the control board circuits.
6. Connect the 11-pin connector from the control
panel.
7. Connect the 10-pin connector and the 4-pin connector from the main wiring harness.
8. Connect the blue wire and black wire to the relay
on the control board.
9. Refer to Adjustments and Optional Settings to
program the new control board.
Page 22
36672 030104
Page 23
CAUT
ION :CAUT
ION :
CAUT ION
:
CAUTION
!
SERVICE (cont.)
SWITCH PANEL
P1875
FIG. 3 SWITCH PANELS
Location:
The Switch Panels are located on the front of the
hood.
Removal and Replacement:
1. Disconnect the 11-pin connector to the switch
panel from the control board.
2. Remove the four #6 screws, nylon washers and
the two #4 screws securing the control board to
the end cap assembly and set aside.
3. Gently pry the switch panel from the end cap assembly.
4. Remove any adhesive that remains on the end
cap.
5. Remove the adhesive backing from the new switch
panel. Insert the ribbon connector through the
slot in the end cap and apply the switch panel to
the end cap.
6. Install the control board to the back side of the
end cap using the four #6 screws, nylon washers
and the two #4 screws to the end cap assembly.
NOTE: The four nylon washers must be installed
under the heads of the four #6 screws to prevent
possible shorting of the control board circuits.
7. Reconnect the 11-pin connector from the switch
panel to the control board making sure every pin
on the control board is inserted into the ribbon
cable plug.
Test Procedures:
The test procedures for the switch panels and the
control boards will vary depending upon the problems
experienced by the brewer. Refer to the troubleshooting
guide beginning on page 10. The troubleshooting guide
is divided into three sections, Refill Circuit, Heating
Circuit and Brewing Circuit.
Page 23
36672 030104
Page 24
CAUTION :
CAUTION
DISCARD DECANTER
IF:
FAILURE TO COMPL
Y RISKS INJURY
FUNNEL CONTENTS
ARE HOT
!
SERVICE (cont.)
DISPENSE VALVE
6. Connect the voltmeter lead ends to the dispense
valve coil terminals. Connect the brewer to the
power source. Brewer temperature lockout must
be disabled. Place "ON/OFF" Switch in the "ON"
position. Press and release the brew switch. The
indication must be 120 volts ac for two-wire 120
volt models and three-wire 120/208 or 120/240
volt models.
7. Disconnect the brewer from the power source.
If voltage is present as described, but no coil action is
observed, nor "clicking" heard, dispense valve is defective. Replace valve and test again to verify repair.
If voltage is not present as described, refer to Wiring
Diagrams and check the brewer wiring harness. Also
check the control board for proper operation. (See
Page 22.)
P1877
FIG. 4 DISPENSE VALVES
Location:
The dispense valves are located inside the top
cover, attached to the sprayhead panels.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Check the water level in the tank to confirm that
it is within 1/2" from the top of the tank.
3. Connect the brewer to the power source. If the
brewer has been set for brewer temperature lockout, this feature must be disabled. (See Page 7
for procedure.)
4. Check the dispense valve for coil action. Place
the ON/OFF switch in the "ON" position, press
and release the BREW switch. Listen carefully in
the vicinity of the dispense valve for a "clicking"
sound as the coil magnet attracts and repels the
plunger.
5. Disconnect the brewer from the power source.
Removal and Replacement:
1. Disconnect wires from the dispense valve.
2. Drain enough water from the tank so the dispense
valve is above the water line.
3. Remove water lines from the dispense valve.
4. Remove the two #8-32 nuts securing the dispense
valve to the sprayhead panel.
5. Install a new dispense valve using the two #8-32
nuts.
6. Reconnect water lines to the dispense valve and
secure in place with clamps.
7. Refer to FIG. 5 when reconnecting wires.
WHI/GRN from PC
Control Board
WHI from Terminal
Block
If the sound is heard as described, there may be a
blockage in the dispense valve or the water line to the
sprayhead. Remove the dispense valve and inspect for
wear, and remove waterborne particles.
If the sound is not heard as described, proceed to
#6.
Page 24
P1853
FIG. 5 DISPENSE VALVE WIRING
36672 030104
Page 25
J1
J2
J3
J4
J5
J6
J7
J1
J2
J3
J4
J5
J6
J7
CAUTION
DISCARD
DECANTER
IF:
FAILURE TO COMPLY RISKS INJURY
FUNNEL CONTENTS
ARE HOT
!
CAUTION :
WARMERS A ND SURF ACE S AR E HOT
CAUTION :
WARMERS A ND SURFA CES AR E H OT
SERVICE (cont.)
LIMIT THERMOSTAT
FIG. 6 LIMIT THERMOSTATS
Removal and Replacement:
1. Remove the black and blue wires from limit ther-
mostat terminals.
2. Carefully slide the limit thermostat out from under
the retaining clip and remove limit thermostat.
3. Carefully slide the new limit thermostat into the
retaining clip.
4. Refer to FIG. 7 when reconnecting the wires.
BLU from Control
Board
P2836
BLK from Terminal
Block
Location:
The limit thermostats are located inside the front
access panel on the front side of the tanks.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Disconnect the blue and black wires from the limit
thermostat.
3. With an ohmmeter, check for continuity across
the limit thermostat terminals.
If continuity is present as described, the limit thermostat
is operating properly.
If continuity is not present as described, replace the
limit thermostat.
P1800
FIG. 7 LIMIT THERMOSTAT WIRING
Page 25
36672 030104
Page 26
SERVICE (cont.)
TANK HEATERS
P1855
FIG. 8 TANK HEATER
Location:
The tank heaters are located inside the tanks and
secured to the tank bottoms.
Test Procedures:
1. Disconnect the brewer from the power supply.
2. With a voltmeter, check the voltage across the red
wire from the terminal block and the black wire
from the control board. Connect the brewer to the
power source. The indication must be 240 volts
ac.
3. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #4
If voltage is not present as described, refer to the Wir-
ing Diagrams and check wiring harness.
4. Disconnect the black wire and the red wire from
the tank heater terminals.
5. Check for continuity across the tank heater terminals.
If continuity is present as described, reconnect the
wires, the tank heater is operating properly.
If continuity is not present as described, replace the
tank heater.
NOTE- If the tank heater remains unable to heat, remove
and inspect heater for cracks in the sheath.
Removal and Replacement:
1. Remove the top cover or top warmer housing and
front access panel as previously described.
2. Disconnect the vent hose from the top of the tank
by pulling the elbow fitting from the grommet in
the top of the tank lid.
3. Drain water from the tank.
4. Disconnect the water supply tube to the dispense
valve from the side of the tank.
5. Disconnect the water supply tube to the solenoid
valve from the bottom of the tank.
6. If removing the left tank, on brewers with faucet,
disconnect the outlet water line to the faucet from
the side of the tank.
7. Disconnect the temperature probe and clip (black
lead) from the top of the tank by pulling the probe
from the grommet in the top of the tank lid.
8. Disconnect the pink wire from the level probe.
9. Disconnect the green wire from the top of the
tank.
10. Disconnect the limit thermostat from the side of
the tank.
11. Disconnect the two white wires from the tank
warmer blanket.
12. Disconnect the black wire and red wire from
the tank heater terminals.
13. Remove the four #8-32 nuts securing the tank to
the mounting brackets and remove the tank assembly.
14. Remove the eight #8-32 nuts securing the tank lid
to the tank.
15. Remove the two hex nuts securing the tank heater
to the bottom of the tank. Remove tank heater with
gaskets and discard.
16. Install new tank heater with gaskets to the bottom
of the tank and secure with two hex nuts.
Page 26
36672 030104
Page 27
SERVICE (cont.)
TANK HEATERS (Cont.)
17. Install tank assembly onto mounting brackets and
secure in place with four #8-32 nuts.
18. Install tank lid and secure in place with eight #8-32
nuts.
19. Connect the two white wires of the tank warmer
blanket.
20. Connect the limit thermostat to the front of the
tank assembly.
21. Connect the green wire to the tank mounting bracket
using #8-32 nut.
22. Connect the pink wire to the level probe.
23. Insert the temperature probe through the grommet
in the tank lid and attach the black lead from the
clip to the sheath.
24. Install the elbow fitting of the vent hose into the
grommet in the tank lid.
25. If installing left tank, on brewers with faucet, connect the outlet water line of the faucet to the side
of the tank and secure with clamp.
26. Connect the water supply tube from the solenoid
to the bottom of the tank and secure with clamp.
27. Connect the water supply tube from the dispense
valve to the side of the tank and secure with
clamp.
28. Refer to FIG. 9 when reconnecting the tank
heater wires.
29. Install access panels and covers and refer to Initial
Set-up for refill and operation.
BLK to Control Board
RED to Terminal Block
P1856
FIG. 9 TANK HEATER WIRING
Page 27
36672 030104
Page 28
CAUT ION :CAU TIO N :
CAUT ION :
J1
J2
J3
J4
J5
J6
J7
J1
J2
J3
J4
J5
J6
J7
CAUT ION :
WARME RS AN
D SU
RFACE S
ARE
HOT
CAUTIO N :
WARMERS AN D SUR FAC ES AR
E HOT
SERVICE (cont.)
REFILL VALVE
6. Check the refill valve for coil action. Connect the
brewer to the power source. With "ON/OFF" switch
in the "ON' upper position press start switch and
listen carefully in the vicinity of the refill valve for
a" clicking" sound as the coil magnet attracts.
7. Disconnect the brewer from the power source.
If the sound is heard as described and water will not
pass through the refill valve, there may be a blockage
in the water line before the refill valve or, the solenoid
valve may require inspection for wear, and removal of
waterborne particles.
If the sound is not heard as described, replace the
refill valve.
P2837
FIG. 10 REFILL VALVE
Location:
The refill valves are located inside the trunk on the
lower center part of the component brackets.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Disconnect the white and white/blue wires from
the refill valve. Set the "ON/OFF" switch in the "ON"
upper position.
3. With a voltmeter, check the voltage across the coil
wires. Connect the brewer to the power source.
The indication must be 120 volts ac.
4. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #5.
If voltage is not present as described, refer to Wiring
Diagrams and check brewer wiring harness.
5. Check for continuity across the refill valve coil
terminals.
Removal and Replacement:
1. Remove both wires from the refill valve.
2. Turn off the water supply to the brewer.
3. Disconnect the water lines to and from the refill
valve.
4. Remove the two 1/4"-20 screws securing the refill
valve mounting bracket to the component bracket.
Remove bracket and valve as an assembly.
5. Using two 1/4"-20 screws install the new refill valve
and bracket to the component bracket.
6. Securely fasten the water lines to and from the
valve.
7. Refer to FIG. 11 when reconnecting the wires.
WHI from Terminal
Block
If continuity is present as described, reconnect the
white and white/blue wires from the circuit board.
If continuity is not present as described, replace the
refill valve.
Page 28
WHI/BLU from
Control Board
P1858
FIG. 11 REFILL VALVE WIRING
36672 030104
Page 29
CAUT
IO
N :
CAUT
IO
N :
CAUTION
:
CAUTION
!
SERVICE (cont.)
WARMER ELEMENT(S)
P1875
FIG. 12 WARMER ELEMENTS
Location:
The warmer elements are located under the warmer
plates.
5. Check the continuity across the two terminals on
the warmer element.
If continuity is present as described, reconnect the
two wires to the warmer element.
If continuity is not present as described, replace the
warmer element.
Removal and Replacement:
1. Remove the three #4-40 screws securing the
warmer assembly to the brewer.
2. Lift the warmer assembly from the brewer.
3. Disconnect the two wires from the warmer element
terminals.
4. Remove the two #8-32 nuts securing the warmer
element to the warmer plate.
5. Securely install new warmer element.
6. Reconnect the two wires to warmer element ter-
minals.
7. Securely install warmer assembly on the brewer.
8. Refer to the Wiring Diagrams when reconnecting
the wires.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Use the white wire from the terminal block and the
other bottom wire on the "ON/OFF" switch.
3. With a voltmeter, check voltage across the two
wires with the "ON/OFF" switch in the "ON" position. Connect the brewer to the power source. The
indication must be 120 volts ac.
4. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #5.
If voltage is not present as described, refer to Wiring
Diagrams and check brewer wiring harness.
Page 29
36672 030104
Page 30
SCHEMATIC WIRING DIAGRAM CDBC TWIN 0/6 (LEFT)
29323.0000E 02/07 ©1999 BUNN-O-MATIC CORPORATION
TANK HEATER
GRN
GRN
RED-14
BLK
BLK-14
SCHEMATIC WIRING DIAGRAM CDBC TWIN 0/6 (RIGHT)
WHI
WHI-14
WHI-14
BLK-14
BLK-14
RED-14
BREWERS WITH 1 POWER CORD ONLY
L1 NL2
L1 NL2
P1, P2, &
P3 ARE
PINS OF A
POLARIZED
THREE-PIN
CONNECTOR.
SOL
P1
BLU-14
BLU-14
"KEEP WARM" HEATER
WHI
BREW STATION WARMER
(CONTROLLED BY ON/OFF SW)
LIMIT
THERMOSTAT
P2
P3
WHI/RED
WHI/RED
WHI
REAR WARMER
FRONT WARMER
WHI
WHI
WHI
WHI
WHI
WHI
SOL
REFILL
DISPENSE
J1-1
J1-2
J1-1
J1-5
J1-10
C
O
NTR
O
L
P C
BOA
R
D
COM
N.O.
BLK
BLK-14
BLK-14
BLK
WHI/GRN
WHI/GRN
WHI/BLU
WHI/BLU
COUNTER
(OPTIONAL)
YEL
WHI/VIO
WHI/VIO
WHI/VIO
BLK
WHI
YEL YEL
W
H
I
LEFT CONTROL PANEL ASSY
J2-1
J2-6
J2-11
BREW SW
STATIC
SHIELD
ON/OFF SW
HIDDEN SW
LT FRNT SW
LT REAR SW
J3-1
J3-4
BLK
PNK
WHI
GRN
LEVEL
PROBE
t
TANK HEATER
BLK
BLK-14
WHI
P1, P2, &
P3 ARE
PINS OF A
POLARIZED
THREE-PIN
CONNECTOR.
SOL
P2
P1
FRONT WARMER
P3
BRN/BLK
VIO
WHI
REAR WARMER
BLU-14
BLU-14
"KEEP WARM" HEATER
WHI
BREW STATION WARMER
(CONTROLLED BY ON/OFF SW)
LIMIT
THERMOSTAT
BRN/BLK
VIO
WHI/RED
WHI/RED
WHI
WHI
WHI
WHI
WHI
WHI
SOL
REFILL
DISPENSE
J1-1
J1-2
J1-1
J1-5
J1-10
C
O
NTR
O
L
P C
BOA
R
D
COM
N.O.
BLK
BLK-14
BLK-14
BRN/BLK
BLK
WHI/GRN
WHI/GRN
WHI/BLU
WHI/BLU
COUNTER
(OPTIONAL)
VIO
BLK
WHI
W
H
I
RIGHT CONTROL PANEL ASSY
J2-1
J2-6
J2-11
BREW SW
STATIC
SHIELD
ON/OFF SW
HIDDEN SW
RT REAR SW
RT FRNT SW
J3-1
J3-4
BLK
PNK
WHI
GRN
LEVEL
PROBE
t
RED-14
RED-14
White Strip-Tac Plus
Black Ink
Finished Size: 14.0" x 8.5"
87% Reduction
J5-1
BLK
J5-1
BLK
L1
L2 N
BLK
RED
MAIN ON/OFF SWITCH
(Late Models only)
GRN
120/208V AC 3 WIRE + GND
120/240V AC 3 WIRE + GND
SINGLE PHASE
120/208V AC 3 WIRE + GND
120/240V AC 3 WIRE + GND
SINGLE PHASE
MODELS WITH THREE TERMINAL BLOCKS
Page 30
36672 020708
Page 31
29323.0002C 02/07 ©2000 BUNN-O-MATIC CORPORATION
TANK HEATER
RED-14 (MODEL 35)
BLK
BLK-14
WHI
L1 NL2
L1 NL2
P1, P2, &
P3 ARE
PINS OF A
POLARIZED
THREE-PIN
CONNECTOR.
SOL
P1
BLU-14
BLU-14
"KEEP WARM" HEATER
WHI
BREW STATION WARMER
(CONTROLLED BY ON/OFF SW)
LIMIT
THERMOSTAT
P3
WHI/RED
WHI/RED
WHI
TOP FRONT WARMER
WHI
WHI
WHI
WHI
WHI
SOL
REFILL
DISPENSE
J1-1
J1-2
J1-1
J1-5
J1-10
C
O
NTR
O
L
P C
BOA
R
D
COM
N.O.
BLK
BLK-14
BLK-14
BLK
WHI/GRN
WHI/GRN
WHI/BLU
WHI/BLU
COUNTER
(OPTIONAL)
120/208V AC 3 WIRE + GND
120/240V AC 3 WIRE + GND
SINGLE PHASE
120/208V AC 3 WIRE + GND
120/240V AC 3 WIRE + GND
SINGLE PHASE
VIO VIO
BLK
WHI
LEFT CONTROL PANEL ASSY
J2-1
J2-6
J2-11
BREW SW
STATIC
SHIELD
ON/OFF SW
HIDDEN SW
TOP FRNT SW
TOP FRNT SW
J3-1
J3-4
BLK
PNK
WHI
GRN
LEVEL
PROBE
t°
TANK HEATER
BLK
BLK-14
WHI
P1, P2, &
P3 ARE
PINS OF A
POLARIZED
THREE-PIN
CONNECTOR.
SOL
P1
BLU-14
BLU-14
"KEEP WARM" HEATER
WHI
BREW STATION WARMER
(CONTROLLED BY ON/OFF SW)
LIMIT
THERMOSTAT
WHI/RED
WHI/RED
WHI
WHI
WHI
WHI
WHI
WHI
SOL
REFILL
DISPENSE
J1-1
J1-2
J1-1
J1-5
J1-10
C
O
NTR
O
L
P C
BOA
R
D
COM
N.O.
BLK
BLK-14
BLK-14
BLK
WHI/GRN
WHI/GRN
WHI/BLU
WHI/BLU
COUNTER
(OPTIONAL)
VIO
BLK
WHI
RIGHT CONTROL PANEL ASSY
J2-1
J2-6
J2-11
BREW SW
STATIC
SHIELD
ON/OFF SW
HIDDEN SW
J3-1
J3-4
BLK
PNK
WHI
GRN
LEVEL
PROBE
t°
RED-14 (MODEL 35)
P3
TOP FRONT WARMER
VIO
J5-1
BLK
J5-1
BLK
SCHEMATIC WIRING DIAGRAM CDBC TWIN 2/2 (LEFT)
GRN
GRN
SCHEMATIC WIRING DIAGRAM CDBC TWIN 2/2 (RIGHT)
WHI-14
WHI-14
BLK-14
BLK-14
RED-14
BREWERS WITH 1 POWER CORD ONLY
RED-14
L1
L2 N
BLK
RED
MAIN ON/OFF SWITCH
(Late Models only)
GRN
White Strip-Tac Plus
Black Ink
Finished Size: 14.0" x 8.5"
87% Reduction
MODELS WITH THREE TERMINAL BLOCKS
Page 31
36672 020708
Page 32
SCHEMATIC WIRING DIAGRAM CDBC TWIN APS (LEFT)
32161.0000C 02/07 ©1999 BUNN-O-MATIC CORPORATION
TANK HEATER
GRN
GRN
RED-14
BLK
BLK-14
SCHEMATIC WIRING DIAGRAM CDBC TWIN APS (RIGHT)
WHI
L1 NL2
L1 NL2
SOL
BLU-14
BLU-14
"KEEP WARM" HEATER
WHI
LIMIT
THERMOSTAT
WHI
WHI
WHI
WHI
SOL
REFILL
DISPENSE
J1-1
J1-2
J1-1
J1-5
J1-10
C
O
NTR
O
L
P C
BOA
R
D
COM
N.O.
BLK
BLK-14
BLK-14
BLK
WHI/GRN
WHI/GRN
WHI/BLU
WHI/BLU
COUNTER
(OPTIONAL)
120/208V AC 3 WIRE + GND
120/240V AC 3 WIRE + GND
SINGLE PHASE
120/208V AC 3 WIRE + GND
120/240V AC 3 WIRE + GND
SINGLE PHASE
BLK
WHI
LEFT CONTROL PANEL ASSY
J2-1
J2-6
J2-11
BREW SW
STATIC
SHIELD
ON/OFF SW
HIDDEN SW
J3-1
J3-4
BLK
PNK
WHI
GRN
LEVEL
PROBE
t°
TANK HEATER
BLK
BLK-14
WHI
SOL
BLU-14
BLU-14
"KEEP WARM" HEATER
WHI
LIMIT
THERMOSTAT
WHI
WHI
WHI
WHI
SOL
REFILL
DISPENSE
J1-1
J1-2
J1-1
J1-5
J1-10
C
O
NTR
O
L
P C
BOA
R
D
COM
N.O.
BLK
BLK-14
BLK-14
BLK
WHI/GRN
WHI/GRN
WHI/BLU
WHI/BLU
COUNTER
(OPTIONAL)
BLK
WHI
RIGHT CONTROL PANEL ASSY
J2-1
J2-6
J2-11
BREW SW
STATIC
SHIELD
ON/OFF SW
HIDDEN SW
J3-1
J3-4
BLK
PNK
WHI
GRN
LEVEL
PROBE
t°
RED-14
White Strip-Tac Plus
Black Ink
Finished Size: 14.0" X 8.5"
~85% Reduction
WHI-14
BLK-14
BLK-14
BREWERS WITH 1 POWER CORD ONLY
RED-14
L1
L2 N
BLK
RED
MAIN ON/OFF SWITCH
(Late Models only)
GRN
WHI-14
RED-14
MODELS WITH THREE TERMINAL BLOCKS
Page 32
36672 020708
Page 33
TOP FRONT
BREW
ENABLE BREW
PROGRAM
White Strip-Ta c Plus
Black Ink
Finished Size: 14.0" x 8.5"
87% Reduction
WHI-14
RED-14
SCHEMATIC WIRING DIAGRAM CDBC TWIN 2/2
29323.0006B 02/08 ©2007 BUNN-O-MATIC CORPORATION
TANK HEATER
BLK-18
WHI-14
WHI/YEL
BLU-14
BLU-14
"KEEP WARM" HEATER
WHI
BREW STATION WARMER
LIMIT
THERMOSTAT
WHI/REDWHI/RED
WHI
WHI
WHI
WHI
REFILL SOL
DISPENSE SOL
C
O
NTR
O
L
P
C BOA
R
D
BLK
BLK-14
BLK-14
WHI/YEL
BLK
WHI/GRN
WHI/GRN
WHI/BLU
WHI
WHI/BLU
COUNTER
(OPTIONAL)
BLK
J3
BLK
PNK
WHI
GRN
LEVEL
PROBE
t˚
RED-14
J5
BLK
BREWERS WITH 1 POWER CORD ONLY
L1
L2 N
BLK
RED
MAIN ON/OFF SWITCH
(Late Models only)
GRN
WHI
BLK-14
Chassis Ground
Earth Ground
Main Harness
p/n 40666.0002
Harness, Switch to Term Block
P/N 38920.0002
J2
1
STATIC SHIELD
5
10
1
4
1
4
120/208V AC 3 WIRE + GND
120/240V AC 3 WIRE + GND
SINGLE PHASE
J1
10
C
O
NTR
O
L
P
A
N
E
L
1
5
TRM 1
TRM 2
COM
N.O.
L. Level Harness-p/n 28743.0000
TANK HEATER
BLK-18
P1, P2, &
P3 ARE
PINS OF A
POLARIZED
THREE-PIN
CONNECTOR
YEL
WHI
BLU-14
BLU-14
"KEEP WARM" HEATER
BREW STATION WARMER
LIMIT
THERMOSTAT
RED/BLK
WHI
WHI
WHI
WHI
WHI
REFILL SOL
DISPENSE SOL
C
O
NTR
O
L
P
C BOA
R
D
BLK
BLK-14
BLK-14
YEL
BLK
WHI/GRN
WHI/GRN
WHI/BLU
WHI
WHI/BLU
COUNTER
(OPTIONAL)
BLK
J3
BLK
PNK
WHI
GRN
LEVEL
PROBE
t˚
J5
BLK
(TOP WARMERS)
RIGHT
LEFT
P2P3 P1
WHI
BLK-14
BLK-14
BLK-18
Warmer Harness
p/n 23950.0002
TOP FRONT
J2
1
BREW
STATIC SHIELD
ENABLE BREW
PROGRAM
5
10
1
4
1
4
J1
10
C
O
NTR
O
L
P
A
N
E
L
1
5
TRM 1
TRM 2
COM
N.O.
L. Level Harness-p/n 28743.0000
YEL
WHI
W/V
A
A
Page 33
36672 020708
MODELS WITH ONE TERMINAL BLOCK
Page 34
WHI-14
RED-14
SCHEMATIC WIRING DIAGRAM CDBC TWIN 4/2
29323.0007B 02/08 ©2007 BUNN-O-MATIC CORPORATION
TANK HEATER
BLK-18
WHI-14
P1, P2, &
P3 ARE
PINS OF A
POLARIZED
THREE-PIN
CONNECTOR
WHI
BLU-14
BLU-14
"KEEP WARM" HEATER
WHI
BREW STATION WARMER
LIMIT
THERMOSTAT
WHI/REDWHI/RED
WHI
WHI
WHI
WHI
REFILL SOL
DISPENSE SOL
C
O
NTR
O
L
P
C BOA
R
D
BLK
BLK-14
BLK-14
BRN/BLK
BLK
WHI/GRN
WHI/GRN
WHI/BLU
WHI
WHI/BLU
COUNTER
(OPTIONAL)
VIO
BLK
J3
BLK
PNK
WHI
GRN
LEVEL
PROBE
t˚
RED-14
White Strip-Ta c Plus
Black Ink
Finished Size: 14" x 8.5"
87% Reduction
J5
BLK
BREWERS WITH 1 POWER CORD ONLY
L1
L2 N
BLK
RED
MAIN ON/OFF SWITCH
(Late Models only)
GRN
(TOP WARMERS)
REAR
FRONT
P2P3 P1
WHI
BLK-14
Chassis Ground
Earth Ground
Main Harness
p/n 40666.0001
Harness, Switch to Term Block
P/N 38920.0002
Warmer Harness
p/n 24204.0001
TOP FRONT
TOP REAR
J2
1
BREW
STATIC SHIELD
ENABLE BREW
PROGRAM
5
10
1
4
1
4
120/208V AC 3 WIRE + GND
120/240V AC 3 WIRE + GND
SINGLE PHASE
J1
10
C
O
NTR
O
L
P
A
N
E
L
1
5
TRM 1
TRM 2
COM
N.O.
L. Level Harness-p/n 28743.0000
TANK HEATER
BLK-18
P1, P2, &
P3 ARE
PINS OF A
POLARIZED
THREE-PIN
CONNECTOR
WHI
BLU-14
BLU-14
"KEEP WARM" HEATER
BREW STATION WARMER
LIMIT
THERMOSTAT
RED/BLK
WHI
WHI
WHI
WHI
WHI
REFILL SOL
DISPENSE SOL
C
O
NTR
O
L
P
C BOA
R
D
BLK
BLK-14
BLK-14
YEL
BLK
WHI/GRN
WHI/GRN
WHI/BLU
WHI
WHI/BLU
COUNTER
(OPTIONAL)
WHI/VIO
BLK
J3
BLK
PNK
WHI
GRN
LEVEL
PROBE
t˚
J5
BLK
(TOP WARMERS)
REAR
FRONT
P2P3 P1
WHI
BLK-14
BLK-14
BLK-18
Warmer Harness
p/n 24204.0000
TOP FRONT
TOP REAR
J2
1
BREW
STATIC SHIELD
ENABLE BREW
PROGRAM
5
10
1
4
1
4
J1
10
C
O
NTR
O
L
P
A
N
E
L
1
5
TRM 1
TRM 2
COM
N.O.
L. Level Harness-p/n 28743.0000
YEL
WHI
W/V
BRN/BLK
WHI
VIO
MODELS WITH ONE TERMINAL BLOCK
36672 020708
Page 34
Page 35
White Strip-Tac Plus
Black Ink
Finished Size: 14.0" x 8.5"
87% Reduction
WHI-14
RED-14
SCHEMATIC WIRING DIAGRAM CDBC TWIN 0/6
29323.0005B 02/08 ©2007 BUNN-O-MATIC CORPORATION
TANK HEATER
BLK-18
WHI-14
BRN/BLK
VIO
WHI
BLU-14
BLU-14
"KEEP WARM" HEATER
WHI
BREW STATION WARMER
LIMIT
THERMOSTAT
WHI/REDWHI/RED
WHI
WHI
WHI
WHI
REFILL SOL
DISPENSE SOL
#/.42/,
0#
"/!2$
BLK
BLK-14
BLK-14
BRN/BLK
BLK
WHI/GRN
WHI/GRN
WHI/BLU
WHI
WHI/BLU
COUNTER
(OPTIONAL)
VIO
BLK
J3
BLK
PNK
WHI
GRN
LEVEL
PROBE
t˚
RED-14
J5
BLK
BREWERS WITH 1 POWER CORD AND 1 TERMINAL BLOCK ONLY
L1
L2 N
BLK
RED
MAIN ON/OFF SWITCH
(Late Models only)
GRN
(TOP WARMERS)
REAR
FRONT
WHI
BLK-14
Chassis Ground
Earth Ground
Main Harness
p/n 40666.0000
Harness, Switch to Term Block
P/N 38920.0002
Warmer Harness
p/n 24204.0001
RIGHT FRONT
RIGHT REAR
J2
1
BREW
STATIC SHIELD
ENABLE BREW
PROGRAM
5
10
1
4
1
4
120/208V AC 3 WIRE + GND
120/240V AC 3 WIRE + GND
SINGLE PHASE
J1
10
1
5
TRM 1
TRM 2
COM
N.O.
L. Level Harness-p/n 28743.0000
TANK HEATER
BLK-18
YEL
WHI/VIO
WHI
BLU-14
BLU-14
"KEEP WARM" HEATER
BREW STATION WARMER
LIMIT
THERMOSTAT
RED/BLK
RED/BLK
WHI
WHI
WHI
WHI
WHI
REFILL SOL
DISPENSE SOL
#/.42/,
0#
"/!2$
BLK
BLK-14
BLK-14
YEL
BLK
WHI/GRN
WHI/GRN
WHI/BLU
WHI
WHI/BLU
COUNTER
(OPTIONAL)
WHI/VIO
BLK
J3
BLK
PNK
WHI
GRN
LEVEL
PROBE
t˚
J5
BLK
(TOP WARMERS)
REAR
FRONT
WHI
BLK-14
BLK-14
BLK-18
Warmer Harness
p/n 24204.0000
LEFT FRONT
LEFT REAR
J2
1
BREW
STATIC SHIELD
ENABLE BREW
PROGRAM
5
10
1
4
1
4
J1
10
1
5
TRM 1
TRM 2
COM
N.O.
L. Level Harness-p/n 28743.0000
LEFT
MEMBRANE
SWITCH-
p/n 29006.0001
YEL
WHI
W/V
BRN/BLK
WHI
VIO
RIGHT
MEMBRANE
SWITCH-
p/n 29006.0002
PROBE CLIP-
p/n 34813.0000
PROBE CLIP-
p/n 34813.0000
MODELS WITH ONE TERMINAL BLOCK
Page 35
36672 020708
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